Safety helmet



FIG. 1 is a front side perspective view showing our new design for safety helmet;

FIG. 2 is a rear side perspective view thereof.

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof; and,

FIG. 7 is a top view thereof.

The details shown in broken lines in FIG. 3 form no part of the claimed design. 

CLAIM I claim the ornamental design for a safety helmet, as shown and described. 